manualshive.com logo in svg

Lectrosonics SRA, Instruction Manual, Page: 5 / 28

Share
Download
Lectrosonics SRA Instruction Manual Download Page 5

UHF Digital Hybrid Wireless

®

Rio Rancho, NM

5

General Technical Description

SmartDiversity

™

 allows each receiver to run indepen-

dently to provide two separate audio channels. The 

algorithm analyzes both the incoming RF level and the 

rate of change in RF level to determine the optimum 
timing for phase switching, and the optimum antenna 
phase. The system also employs “opportunistic switch-

ing” to analyze and then latch the phase in the best 

position during brief squelch activity.  

Ratio Diversity blends the audio outputs of both receiv-
ers in a seamless manner to produce a single audio 
output. A panning circuit blends more signal from the re-
ceiver with the stronger RF signal over a wide RF level 
range to anticipate and eliminate dropouts long before 
they occur. When a good RF signal is present at both 
receivers and the audio is blended equally, the signal to 
noise ratio is increased by 3 dB.

The design consists of two separate receivers built into 
a single, ultra compact housing with interchangeable 
adapters for video camera wireless receiver slots and 
stand-alone use. Digital Hybrid Wireless

®

 technology 

provides superb, compandor-free audio quality and 
compatibility with other wireless systems. The RF per-
formance is extremely stable over a very wide tempera-
ture range, making the receiver perfectly suited to the 
rough environmental conditions found in field produc-
tion.

The front panel features a menu-driven LCD interface 

and four membrane switches used to view and alter set-
tings. Audio outputs are provided on the rear panel for 
camera slots or other audio devices, and in the case of  
the SRa5P, on the front panel through a 5-pin TA Series 
connector.

A built-in spectrum analyzer scans across the tuning 

range of the receiver to locate RF signals in the vicinity 
to simplify finding clear operating frequencies.

RF PCB Block Diagram

Ref. Osc

SAW

filter

RF amp

Splitter

Phase
switch

Mixer

IF 

amp

243.950 MHz

SAW

filter

SAW

filter

IF 

amp

243.950 MHz

Rx IC

250 kHz

RSSI

Window 

detect

Audio 1

Pulse 

detector

1st

VCO

2nd

VCO

PLL

µ

P

SAW

filter

RF amp

Splitter

Phase
switch

Mixer

IF 

amp

248.450 MHz

SAW

filter

SAW

filter

IF 

amp

248.450 MHz

Rx IC

350 kHz

RSSI

Window 

detect

Audio 2

Pulse 

detector

1st

VCO

2nd

VCO

PLL

µ

P

Receiver 1

Receiver 2

High side 
injection

High side 
injection

244.200 MHz

248.800 MHz

SR Dual Receiver RF Board

Audio PCB Block Diagram

µP

DSP

Keypad

LCD

display

DAC

Codec

Memory

Ref xtal

Audio 1

Audio 2

(from RF PCB)

To both PLL

To phase switches

Audio amps

Digital po

t

Digital po

t

µP 

digital 

atten

CH 1

audio switch

CH 2

audio switch

Fuse

Camera

power in

Osc

sync

DC-DC

conv

DC-DC

conv

DC-DC

conv

On/Off

–5V

+5V

Osc

sync

+1.6V

+3.3

V Reg

+3.3V

5k

5k

50

50

+

–

Com

Hi

Lo

+5V

+5V

5k

5k

50

50

+

–

Com

Hi

Lo

+5V

+5V

Diode 

protected 

outputs

1

2

3

4

5

Summary of Contents for SRA

Page 1: ...al UHF Receiver Featuring Digital Hybrid Wireless Technology INSTRUCTION MANUAL Rio Rancho NM USA www lectrosonics com Fill in for your records Serial Number Purchase Date U S Patent 7 225 135 See Quick Start Summary on page 3 ...

Page 2: ...SRa5P and SRa Dual Receivers LECTROSONICS INC 2 ...

Page 3: ...g the receiver Install either stand alone or camera slot adapter kit the antennas and position the receiver as it will be used see pages 9 12 Connect power to the receiver see pages 10 11 Set the COMPAT compatibility mode for the trans mitters to be used see pages 15 16 Find clear operating frequencies for one or both receivers see pages 19 21 NOTE When operating in the 2 channel mode always set R...

Page 4: ...Buttons 8 Rear Panel and Adapters 8 Camera Slot Adapters 9 Installing Camera Slot Adapters 9 Adapters for Stand alone Use 10 Installing Rear Panel Adapters 10 Battery Adapter 10 Audio Output Cables 11 External Power Cables 11 External Power Supply 11 Mounting and Orientation 12 Main Window LCD 13 LCD Backlight Setup 14 Navigating the LCD 15 Main Window 16 Frequency Screen 16 Setup Screens 16 Front...

Page 5: ... making the receiver perfectly suited to the rough environmental conditions found in field produc tion The front panel features a menu driven LCD interface and four membrane switches used to view and alter set tings Audio outputs are provided on the rear panel for camera slots or other audio devices and in the case of the SRa5P on the front panel through a 5 pin TA Series connector A built in spec...

Page 6: ... occur when the power is turned on or off The pilot tone frequency is different for each of the 256 frequencies in the tuning range of a system frequency block This eliminates squelch problems in multichannel systems where a pilot tone signal can appear in the wrong receiver via intermodulation products The DSP generated pilot tone also eliminates fragile crystals allowing the receiver to survive ...

Page 7: ...on on RF signal strength Perfor mance of the two systems is virtually identical but the noise based system requires no calibration and there is no better way to track the signal to noise ratio than to measure it directly RF Controlled Digital Noise Filter In extremely weak signal conditions an RF sensitive variable frequency filter is applied to reduce the high frequency response of the receiver T...

Page 8: ...ower off It also functions as a back button while navi gating the various menus and setup screens to return to the previous screen or menu item The firmware remembers whether the receiver was turned on or off after power is disconnected and it returns to that state when power is restored This allows the receiver to power up and down as the camera is turned on and off Press the PWR BACK button from...

Page 9: ...em with the tabs on the adapter Slide the adapter up and tighten the retaining screws to secure it to the receiver flange The four lower screws attach to the camera body SRSNY Adapter Two different types of screws are used to attach the receiver flange and the adapter Thread the smaller thin head screws through the adapter and into the camera body Upper screws with thicker heads secure the receive...

Page 10: ...or use in por table bag systems Two balanced output cables and the power cable are 6 feet long Cut the cables to the desired length and terminate as needed Battery Adapter The receiver can be powered with an optional battery sled adapter that attaches to the outside of the housing Lec trosonics Model SRBATTSLED The adapter includes an inte grated connector plate and accepts L and M type video came...

Page 11: ... long TA3 female to XLR male 3 pin for balanced output PIN 1 Shield PIN 2 Audio PIN 3 Audio MCSRTRS Male 3 5 mm TRS plug to two female TA3 mini XLR connectors for dual channel use External Power Supply The CH20 power supply with a locking LZR power jack 110 VAC input 12V DC regulated output 400 mA max External Power Cables 21747 Locking LZR style plug to stripped and tinned 6 feet long 21746 Locki...

Page 12: ...in horizontal and vertical positions using the mounting foot SRSLEEVE Mount An optional mounting sleeve is available to simplify mounting the receiver on camera body battery brack ets and other locations The sleeve is furnished with a hook loop Velcro swatch for mounting on flat surfaces SRHARDWARE Cold Foot Adapter This hardware and adapter kit allows the SRSLEEVE to be mounted on a cold shoe A r...

Page 13: ...3 200 588 700 Red 4 48 23 588 800 614 300 Orange 4 24 24 614 400 639 900 Yellow 4 01 25 640 000 665 500 Green 3 81 26 665 600 691 100 Blue 3 62 Whip Antennas Lectrosonics AMM Series UHF transmitter antennas follow the color code specifications in the chart below to identify operating frequency block range The frequen cy block range is engraved on the outside housing for each individual transmitter...

Page 14: ...p Jointed Whip Antennas The AMJ antenna is a general purpose design for any Lectrosonics receiver or transmitter with a standard SMA connector The hinged joint pivots in both direc tions for positioning the whip at any desired angle 470 470 100 495 600 Black w Label 5 56 141 2 mm 19 486 400 511 900 Black w Label 5 27 133 9 mm 20 512 000 537 500 Black w Label 4 93 125 2 mm 21 537 600 563 100 Brown ...

Page 15: ... mode and the other when RATIO DIVERSITY is selected The icon changes in size horizontally to indicate the audio level modulation of the signal received from the transmitter The icon display will change to a solid rectangular block when the audio signal is being limited in the transmitter Battery Levels When the COMPAT mode is set for a compatibility mode that supports battery telemetry 400 and 20...

Page 16: ...SmtNR SETUP PHASE SETUP TXBAT SETUP MIXMODE SETUP TONE SETUP SEL BACK PHASE PHASE RECEIVER 1 RECEIVER 2 Press UP DOWN to select Press SEL to select receiver SEL BACK TXBAT TXBAT RECEIVER 1 RECEIVER 2 Press UP DOWN to select Press SEL to select receiver SEL BACK MIXMODE Press UP DOWN to select SEL BACK TONE RECEIVER 1 RECEIVER 2 Press UP DOWN to select Press SEL to select receiver 00 05 Tone will b...

Page 17: ...tup SEL to select the next item LEVEL This setup screen displays the audio output level of the receiver in dBu Use the SEL Up or Down buttons to change the level Range is from 50 to 5 dBu in 1 dB steps Press the SEL button to leave this screen The output levels at the two jacks may be set indepen dently regardless of the diversity mode setting SCAN This function provides a fast and reliable method...

Page 18: ...is not included in the group letter will blink in this case SmtNR This setup screen is available only in the 400 Series COMPAT compatibility mode Select the desired mode while listening to the audio to of one of three choices OFF provides no noise reduction for complete transparency which is useful in controlled environ ments with very little high frequency noise such as an indoor motion picture p...

Page 19: ...VER 2 TONE 00 05 Once the button is pressed a 1 kHz tone is enabled and its level can be adjusted with additional presses on the UP or DOWN buttons The level set here will be retained in the regular oper ating mode it will supersede the setting made in the LEVEL setup screen The test tone has 1 distortion and is intended for confirmation of output levels only To exit the test tone screen and stop ...

Page 20: ... by the cursor are shown in the upper right corner of the screen Scanning for Clear Frequencies Press both the UP and DOWN buttons at the same time to switch to the Zoom View In this view the cursor remains fixed in the center of the screen and the back ground scrolls behind it The frequency can be stepped up and down in 100 kHz increments using the UP and DOWN arrow buttons To clear the scan memo...

Page 21: ...6 569 300 3 D tv30 594 900 3 D tv34 473 300 2 0 TV14 498 900 7 D TV18 524 500 7 D TV23 550 100 7 D tv27 575 700 7 D tv31 601 300 7 D tv35 475 500 3 6 TV14 501 100 9 3 TV19 526 700 9 3 TV23 552 300 9 3 tv27 577 900 9 3 tv31 603 500 9 3 tv36 476 200 3 D TV15 501 800 9 A TV19 527 400 9 A TV23 553 000 9 A tv27 578 600 9 A tv32 604 200 9 A tv36 Grp B 477 500 4 A TV15 503 100 A 7 TV19 528 700 A 7 TV23 5...

Page 22: ...2 666 100 0 5 tv46 691 700 0 5 tv50 717 300 0 5 tv55 742 900 0 5 tv59 615 500 0 B tv38 641 100 0 B tv42 666 700 0 B tv46 692 300 0 B tv51 717 900 0 B tv55 743 500 0 B tv59 616 400 1 4 tv38 642 000 1 4 tv42 667 600 1 4 tv46 693 200 1 4 tv51 718 800 1 4 tv55 744 400 1 4 tv59 617 000 1 A tv38 642 600 1 A tv42 668 200 1 A tv47 693 800 1 A tv51 719 400 1 A tv55 745 000 1 A tv59 618 300 2 7 tv38 643 900...

Page 23: ...s on the previous pages address in system compatibility but obviously do not take into account RF signals from external sources that may be present in the location where the system will be operating Using the scanning process with the RF spectrum analyzer will identify external RF signals but it does not address the compatibility of the selected frequencies It is always good practice to go through...

Page 24: ...hing when transmitter turned on Pilot tone detection can take several seconds Turn on the transmitter power and the audio switch on some models and wait 3 to 5 seconds for the P to indicate steadily Transmitter and receiver not on same frequency Receiver compatibility mode does not match the transmitter in use See SEL Selections from Main Window COMPAT Window Noise on audio and Pilot Tone Indicato...

Page 25: ...noise remains then turn the power off at the transmitter and see if it remains If the noise is still present then the problem is not in the transmitter If noise is still present when the transmitter is turned off try lowering the audio output level on the SRa5P and see if the noise lowers correspondingly If the noise remains the problem is not in the receiver Receiver output is too low for the inp...

Page 26: ...o output phase normal or inverted SmartNR noise reduction OFF NORMAL FULL modes available in 400 Series mode only Audio Performance overall system These specs apply to hybrid mode only Frequency Response 32 Hz to 20 kHz 1dB THD 0 3 system typical in 400 mode Signal to Noise Ratio dB 95 dB or better overall system 400 Series mode Total Harmonic Distortion 0 2 typical 400 Series mode Input Dynamic R...

Page 27: ...epairs Returning Units for Repair For timely service please follow the steps below A DO NOT return equipment to the factory for repair without first contacting us by e mail or by phone We need to know the nature of the problem the model number and the serial number of the equipment We also need a phone number where you can be reached 8 A M to 4 P M U S Mountain Standard Time B After receiving your...

Page 28: ...thorized dealer shipping costs prepaid within one year from the date of purchase This Limited Warranty is governed by the laws of the State of New Mexico It states the entire liablility of Lectrosonics Inc and the entire remedy of the purchaser for any breach of warranty as outlined above NEITHER LECTROSONICS INC NOR ANYONE INVOLVED IN THE PRODUCTION OR DELIVERY OF THE EQUIPMENT SHALL BE LIABLE FO...

Reviews:

No comments